An apparatus for controlling the rate of flow of mold material to a mold cavity, the apparatus comprising: an injection molding machine and a manifold; an actuator interconnected to a valve pin having a tip end; a valve system in fluid communication with the actuator to drive the actuator at one or more rates of travel, the valve system having a start position, one or more intermediate drive rate positions and a high drive rate position, the start position holding the valve pin in a gate closed position; a controller that instructs the valve system to move from the start position to the one or more intermediate drive rate positions and to remain in the one or more intermediate drive rate positions for one or more corresponding predetermined amounts of time.

A rotary-shaft type turntable positioning method of an injection molding machine is disclosed. A first encoder and a second encoder are installed at a driving shaft of a servomotor and a speed reducer respectively, so that after the injection molding machine finishes an injection molding, the driving shaft of the servomotor drives a transmission belt on an output shaft of the speed reducer to rotate a rotary shaft for the turntable to be rotated and positioned. During rotation, the first encoder and the second encoder sense a first rotation signal and a second rotation signal to adjust the position, so as to control the turntable to be rotated to a precise position.

A rotary-shaft type turntable positioning method of an injection molding machine is disclosed. A first encoder and a second encoder are installed at a driving shaft of a servomotor and a speed reducer respectively, so that after the injection molding machine finishes an injection molding, the driving shaft of the servomotor drives a transmission belt on an output shaft of the speed reducer to rotate a rotary shaft for the turntable to be rotated and positioned. During rotation, the first encoder and the second encoder sense a first rotation signal and a second rotation signal to adjust the position, so as to control the turntable to be rotated to a precise position.

The present invention relates to a position determining mechanism for a rotary platen. The rotary platen is disposed to face a mold platen and is provided to be rotatable with respect to the mold platen. The position determining mechanism includes a position determination part which is provided to one platen of the mold platen and the rotary platen, and a position determination driving mechanism which is provided to the other platen, in which the position determination driving mechanism includes a press member and a pressing device, and when the press member is pressed by the pressing device and the press member is fitted into the position determination part, a rotation position of the rotary platen is determined.

The present disclosure relates to a system and method for monitoring an injection molding process which may calculate injection time and packing time by attaching an acceleration sensor to an injection molding mold with bolts and measuring an amplitude change of a vibration signal of a mold during injection molding, detect mold closing and opening signals of the mold using a magnetic hall sensor, and monitor the injection molding process by measuring cycle time and cooling time, thereby simplifying installation and maintenance and reducing installation costs.

The present disclosure relates to a system and method for monitoring an injection molding process which may calculate injection time and packing time by attaching an acceleration sensor to an injection molding mold with bolts and measuring an amplitude change of a vibration signal of a mold during injection molding, detect mold closing and opening signals of the mold using a magnetic hall sensor, and monitor the injection molding process by measuring cycle time and cooling time, thereby simplifying installation and maintenance and reducing installation costs.

A method for determining positions of a real moulding material front during a process to be carried out with a moulding machine, wherein a simulation progression (SV) of a variable characteristic of the process is calculated, positions of a simulated moulding material front are determined from the simulation, the real process is carried out, and at least one measurement progression (MV) of the at least one characteristic variable is measured directly or indirectly, a transformation is chosen, which has at least one parameter (?V, kp, V.sub.unknown), the transformation is applied to the at least one simulation progression (SV), with the result that a transformed simulation progression (tSV) is formed, and a parameter value is determined for the parameter (?V, kp, V.sub.unknown) such that a deviation between the measurement progression (MV) and the transformed simulation progression (tSV) is minimized according to a predetermined error measure or according to an operator input.

A method for determining positions of a real moulding material front during a process to be carried out with a moulding machine, wherein a simulation progression (SV) of a variable characteristic of the process is calculated, positions of a simulated moulding material front are determined from the simulation, the real process is carried out, and at least one measurement progression (MV) of the at least one characteristic variable is measured directly or indirectly, a transformation is chosen, which has at least one parameter (?V, kp, V.sub.unknown), the transformation is applied to the at least one simulation progression (SV), with the result that a transformed simulation progression (tSV) is formed, and a parameter value is determined for the parameter (?V, kp, V.sub.unknown) such that a deviation between the measurement progression (MV) and the transformed simulation progression (tSV) is minimized according to a predetermined error measure or according to an operator input.

The present invention provides an injection device which is capable of injecting a certain amount of a resin material in each injection process, while suppressing entry of air into a barrel and cost increase due to increase in the number of components. An injection device 1 according to the present invention is provided with: a resin material inlet 13; a drive unit 20 which generates a driving force for injecting a resin material from an injection port 12; a plunger 17 which is provided so as to be movable forward and backward in the axial direction of a barrel 11, and moves backward when the resin material flows into the barrel 11 and injects the resin material filled in the barrel 11 through the injection port 12 by moving forward within the barrel 11; a pusher member 18 which pushes the plunger 17 toward the injection port 12 of the barrel 11; a driving force transmission unit 21 which transmits the driving force generated in the drive unit 20 to the pusher member 18; and a control unit 25 which controls these constituent units so that the inflow of the resin material into the barrel 11 is started and measurement of the resin material is completed when the load received by the drive unit 20 from the pusher member 18 located at a specified position reaches a predetermined value.

In an injection molding machine, a predetermined torque limit value set in advance and acceleration/deceleration torque calculated by an acceleration/deceleration torque calculation section are added to set an output torque limit value for a motor. By this operation, quick acceleration or deceleration can be achieved in an injection process, and breakage of a mold and mechanism section of the injection molding machine can be prevented.